TY - JOUR
T1 - Different trajectories of decline for global form and global motion processing in ageing, Mild Cognitive Impairment and Alzheimer’s disease
AU - Porter, Gillian
AU - Wattam-Bell, John
AU - Bayer, Antony
AU - Haworth, Judy
AU - Braddick, Oliver
AU - Atkinson, Janette
AU - Tales, Andrea
PY - 2017/3/14
Y1 - 2017/3/14
N2 - Abstract The visual processing of complex motion is impaired in Alzheimer’s disease (AD). However, it is unclear whether these impairments are biased towards the motion stream or part of a general disruption of global visual processing, given some reports of impaired static form processing in AD. Here, for the first time, we directly compared the relative preservation of motion and form systems in AD, Mild Cognitive Impairment (MCI) and healthy ageing, by measuring coherence thresholds for well-established global rotational motion and static form stimuli known to be of equivalent complexity. Our data confirm a marked motion-processing deficit specific to some AD patients, and greater than any form-processing deficit for this group. In parallel, we identified a more gradual decline in static form recognition, with thresholds raised in MCI patients and slightly further in the AD group compared with controls. We conclude that complex motion processing is more vulnerable to decline in dementia than complex form processing, perhaps owing to greater reliance on long-range neural connections heavily targeted by AD pathology.
AB - Abstract The visual processing of complex motion is impaired in Alzheimer’s disease (AD). However, it is unclear whether these impairments are biased towards the motion stream or part of a general disruption of global visual processing, given some reports of impaired static form processing in AD. Here, for the first time, we directly compared the relative preservation of motion and form systems in AD, Mild Cognitive Impairment (MCI) and healthy ageing, by measuring coherence thresholds for well-established global rotational motion and static form stimuli known to be of equivalent complexity. Our data confirm a marked motion-processing deficit specific to some AD patients, and greater than any form-processing deficit for this group. In parallel, we identified a more gradual decline in static form recognition, with thresholds raised in MCI patients and slightly further in the AD group compared with controls. We conclude that complex motion processing is more vulnerable to decline in dementia than complex form processing, perhaps owing to greater reliance on long-range neural connections heavily targeted by AD pathology.
U2 - 10.1016/j.neurobiolaging.2017.03.004
DO - 10.1016/j.neurobiolaging.2017.03.004
M3 - Article (Academic Journal)
C2 - 28482210
SN - 0197-4580
JO - Neurobiology of Aging
JF - Neurobiology of Aging
ER -